class Course(object):
    def __init__(self,course_id,course_name,course_lv):
        self.course_id = course_id
        self.course_name = course_name
        self.course_lv = course_lv

    def __str__(self):
        return f"Course ID: {self.course_id}, Course Name: {self.course_name}, Course level: {self.course_lv}"
